Attachment for stitch forming mechanisms of sewing machines



Nav. 22, w38. c.. T, GOULD Er AI. 2,137,757

TTQBMEW FR S''ETCH TBMNG MEQHPXISMS F SEWING MACHINES Filed June 2li, 1937 y e 2 2879 gi )if 1 i vi e' 3 i; a3@ j g l Charles 1I Gould, JcrberlJ/lonny,

Patented Nov. 22, 1938 UNITED STATES PATENT oFFlcE .Charles Tr Gould and Herbert M. Bonney, Walpole, Mass.

Application June 21, 1937, Serial No. 149,288

1'4 claims.

This invention relates to sewing machines and particularly to a sewing machine designed 'to 'stitch together the opposite walls of a pad containing uiiy material to expand when pressure 5 is removed therefrom.

The object of the invention is to form elongated loops in the stitches as formed, the length or these loops being sufcientto take care of the subsequent expansion of the pad.

The invention consists primarily in the combination of a reciprocating thread-pulling blade coacting with a holding member consisting of two plates riveted together and separated at the end nearest the needle, whereby in the forward Iii movement of the pulling blade said blade moves over the holding member, seizes the thread and on its return movement pulls a loop of thread between said two plates which retain the loop 20 formed.

For the purpose of illustrating the invention. one preferred form thereof is illustrated in the drawing, this form having been found to give satisfactory and reliable results, although it is 25 to be understood that the various instrumen- Atalities of which the invention consists caribe variously arranged and organized, and the invention is not limited to the precise arrangement and organization of these instrumentalities as herein shown and described except as required by the scope ofthe appended claims. l

Of -the drawing- Figure 1 represents a vertical section of -a 'portion of a sewing machine adapted to sew together the oppositeseparated walls o a pad containing iiuffy material and showing mechanism embodying the present invention, said mechanism showing the loop of thread clamped between the two plates of a loop-holding member. v

Figure 2 represents a similar vertical section showing the hooked thread-pulling blade in position to seize the thread and draw it into a position to be clamped by the holdingmember.

Figure 3Vrepresents a partial plan showing a portion of the presser foot, the loop-holding member mounted thereon, and a portion of the reciprocating hooked thread-pulling member in position to-be movedv forward in the direction of the arrow o'. to seize the thread.

Figure 4 represents a similar View 4showing the hooked-pulling member moved back in the direction of the arrow b and drawing a loop of thread between the two thicknesses of the loop-holding member.

55 Figure 5 represents a .similar view showing the thus formed in position 'until the' next stitch is (ci. 11a-2)? hooked thread-pulling member moved to the end of its rear movement andwith the loop of thread clamped between the two plates of the loopholding member, this view showing in dotted lines the position of said hooked pulling member on its forward movement inthe direction of the ar row c as it is about to pass over the loop-hold" ing member and and looper being actuated in any Well known manner. v

The sewing machine also has a presser foot I4 bearing upon the top of the pad II and keeping the pad under compression while stitches are being formed 'therein by said needle I2 and looper I3,

Positioned near one endr orf the presser foot I4 is a disk I5 mounted upon a shaft I6 having secured to one end thereof Va lever I1 tothe outer end of which is pivoted a reciprocating member I8.

The member I8 may be reciprocated in any well known manner from a crank forming a part of the sewing machine and during the reciprocation of the member I8 it imparts a 90 oscillating movement to the disk i5.

Secured at I9-to the periphery of the disk I5 is a resilient thread-pulling blade 20, the forward end of which rests upon the upper face of the presser foot it.

The forward end of the thread-pulling blade it) is slightly bent upwardly at 2l and is provided with a laterally extending hook 2.

The presser foot it is provided with a plurality of elongated openings 23, said `openings being parallel to each other and through one of which the needle I 2 is adapted to pass and then through the pad Ii to coact with the louper and form the required stitch.

Beneath the presser foot i 4 is a block 2t having an elongated rib 25 positioned in another of 'the openings 23.

Screws 2B threaded to the block 2li extend through notches 21 in a loop-holding member consisting of two thin metal plates 28 and 29, riveted together at 29x, the plate 28 being superimposed upon the plate 29 and being preferably of slightly increased thickness.

'Ihese plates 28 and 29 have rearward extensions 38 projecting beyond the hook 22 ofthe reciprocating thread-pulling blade 20.

As shown in Fig. 3 the upper left hand corner of the extension 38 of the plate 28 is slightly bent upwardly as at 3 I The extension 3D of the lower plate 29 has its upper left hand corner slightly inclined downwardly as indicated at 32 in Fig. 2 of the drawing.

When the thread-pulling blade 20 is moved forwardly from the position indicated in Fig. l of the drawing, the extreme forward end 33 thereof will pass over the rearward extension 30 of the holding plate 28 into the position indicated in Fig. 2 of the drawing, at which point the hook 22 thereof. will be in position to seize the thread 34 extending downwardly from the needle I2 to the looper I 3. It is obvious that the movement of the needle I2 must have such timed relationship to the movement of the blade 20 that the needle I2 will be in its upper position after coacting with.

the thread and draw out the loop 35 and elongate it as shown in the drawing.

On the return movement of the thread-pulling blade 28 the hook 22 will engage'with the inclined portions 3I and 32 of the plates 28 and 29 and will be drawn between these plates 28 and 29 carrying with it the loop 35 as indicated in Figs. 4 and 5 of the drawing..

The loop 35 at this time will be gripped between the plates 28 and 29 and remain thus gripped when the thread-pulling blade `20 moves forward in the direction of the arrow c on Fig. 5, this forward movement of the blade 28 being in a direction opposite to the rearward movement of the work being operated upon .during the stitch forming operation. g

As soon as the hook 22 disengages from the loop 35 the loop will drop sufiiciently to permit the forward end 33 of the thread-pulling blade 28 to pass over the upper plate 28 as indicated in Fig. 3 of the drawing.

As the pad I I is moved toward the rear ofthe sewing machine preparatory to the formation of another stitch therein it will pull the loop 35 from between the plates 28 and 29 and said loop will be carried along with the said pad I I leaving the plates 28 and 29 free to receive another loop upon ghe return movement of the thread-pulling mem- This thread-pulling member 28 is of spring metal and has suiilcient tension to retain it substantially in contact with the upper face of the curved lpresser foot Il during its reciprocation.

By means of the mechanism herein shown an elongated loop may be formed in the formation of each stitch, the length of the loop being sufcient to take care of the expansion of the pad as it moves away from the stitch-forming mechanism.

By means of the screws 26 and notches 21 the loop-holding plates 28 and 29 may be adjusted toward and from the thread-pulling blade 20 until said plates and blade are properly positioned relatively to each other. 'f

The presser foot I4 has a length greater than the width of the pad II being operated upon and a plurality of stitch-forming mechanisms are em-A ployed in connection with the presser foot lin order that a plurality of rows of stitches may be formed simultaneously in the pad I I.

By having a plurality of openings 23 in the presser foot I4 the loop-holding devices may be disposed in any desired openings 23 to vary the spaces between the rows of stitches, it being understood that the other mechanisms coacting withsaid loop-holding devices must receive similar adjustments.

This feature, however, forms no part of the present inventionand consequently it is deemed unnecessary to illustrate the same in detail.

The present invention relates wholly to the novel means whereby elongated loops of thread may be formed during the formation of the stitches and whereby each loop is released prior to the formation of the next stitch.

It must be understood that the needle I2 not only reciprocates up and down but while in thc material being' operated upon it is adapted to oscillate, traveling with the material until it leaves said material when it is moved forward to its original position preparatory to the formation of another stitch.

This oscillation of the needle is effected by means of a small eccentric.

This oscillation of the needle is necessary as the material being sewed is so heavy that it cannot be stopped and started as each stitch is formed.

While in the material the needle swings with said material in the direction said material is traveling and it will swing in the opposite direction when it has left the material in its upward movement.

It is believed that the operation and many advantages of the invention will be understood readily witho-ut further description.

Having described our invention, we claim:

1. In a sewing machine for stitching together the opposite walls of a pad containing a thick layer of fluffy material and having two cooperating stitch forming devices, a mechanism consisting of a at reciprocating blade provided at its forward end with a lateral hook to seize the thread at a point between said devices; means for moving said blade rearwardly to form an elongated loop in said thread; a work support; a presser foot above said support; and independent means secured to the upper face of said presser foot for gripping said loop until the next forward movement of said blade.

2. In a sewing machine for stitching together the opposite walls of a pad containing a thick layer of fluffy material and having two cooper- :ating stitch forming devices, a mechanism consisting of a flat reciprocating blade provided at its forward end with a lateral hook to seize the thread at a point between said devices; means for moving said blade rearwardly to form an elongated loop in said thread; a work support; a presser foot above said support; and coacting flat spring jaws secured to the upper face of said presser foot'for gripping said loop until the next forward movement of said blade.

3. In a sewing machine for stitching together the opposite walls of a pad containing a thick layer of fluffy material and having two cooperating stitch forming devices, a mechanism consisting of a'work support; a curvedl presser foot above said support; a iat reciprocating blade of spring metal provided at its forward end with a hook to seize the thread at a point between said devices, said blade being movable forwardly over 'the upper face of said presser foot; means for moving said blade rearwardly to form an elongated loop in said thread; and independent means secured to the upper face of said presser foot for gripping said loop until the next forward movement of Said blade.

4. In a sewing machine for stitchingtogether the opposite walls of a pad containing a thick layer of fluffy material and having two cooperating stitch forming devices, a mechanism consisting of `a flat flexible reciprocating blade provided at its forward end with a lateral hook to seize the thread at a point between said devices, said hook being. integral with said blade; means for moving saidV blade rearwardly to form an elongated loop in said thread; a work support; a presser foot above said support; and independent means secured to the upper face of said presser foot for gripping said loop until the next forward movement of said blade.

5. In a sewing machine for stitching together the opposite walls of a pad containing a thick layer of uify material and having two cooperating stitch forming devices, a mechanism consisting of a flat reciprocating blade provided at its forward end with a lateral hook to seize the thread at a point between said devices; means for moving said blade rearwardly to form an i elongated loop in said thread; a work support; a

presser foot above said support and independent means secured to said presser foot for gripping said loop until the next forward movement of said blade, said loop gripping means being adjustable toward and from said hook.

6. In a sewing machine for stitching together the opposite Walls of a pad containing a thick layer of fluffy material and having two cooper- A Iating stitch forming devices, a mechanism consisting of a dat reciprocating blade provided at its forward end with a lateral hook to seize the thread at a point between said devices; means for moving said blade rearwardly tohuform an elongated /loop'insa'id thread; a work support; a presser foot above said support; and means mountedon said presser foot.and'extending over an intermediate part of said elongated loop and gripping the same. f

'7. In a sewing machine for stitching together the opposite walls of a pad containing a thick layer of iluily material and having two cooperatingestiteh forming devices, a mechanism consisting of a fiat reciprocating blade provided at its forward end with a lateral hook to seize the thread at a point between said devices; means for moving said blade rearwardly to form an elongated loop in said thread; a work support; a presser foot above said support; and two 'thin plates riveted together and between which said loop is drawn by said blade for temporarily gripping said loop until the next forward movement of said blade, said plates being mounted on Said presser foot and adjustable toward and from said blade.

8. In a sewing machine for` stitching together the opposite walls of a padcontaining a thick layer of uffy material and having two cooperating stitch forming devices, a mechanism consisting of a iiat reciprocating blade provided at its forward end with a lateral hook to Seize the thread at a point between said devices; means forward movement of said blade, said plates at inclined faces at a corner thereof forming a mouth to receive the hook in its rearward movement.

9. In a sewing machine for stitching together the opposite walls of a pad containing a thick layer of fluffy material and having two 4cooperating stitch forming devices, a mechanism consisting of a flat reciprocating blade of spring metal provided at its forward end with a lateral hook to seize the thread between said devices; an oscillating disk to which the rear end of said blade is secured; means for actuating said disk to move said blade endwise in -a forward direction and to move it rearwardly to form an elongated loop in said thread; a work support; a presser foot above said support; and independent means secured to said presser foot for gripping.

said elongated loop until the next forward movement of said blade.'

10. ln a sewing-machine for stitching together the opposite Walls of a. pad containing a thick -layer of udy material and having two cooperatmeans secured to said presser foot for gripping said loop until the next forward movement of said blade; and means for moving said blade for- .ward over the top of said loop gripping means.

11'. In a sewing machine for stitching together the opposite walls ofa pad containing a thick layer of fiuify material and having two cooperating stitch forming devicesa mechanism consisting of a-iiexible at reciprocating blade having its forward end elevated above the body of the blade and provided with a lateral hook to seize the three. at a point between said devices; means for me v.og said blade rearwardly to form an elongated loop in said thread; a work support; a presser foot above said support; means mounted i on said presser foot and having rear extensions between which said elongated loop is adapted to be gripped; and means for moving said blade forwrdly over the top of said gripping extensions thereby releasing the hook from said loop.

12. In a sewing machine for stitching together the opposite walls of a pad containing a thick layer of fluiy material and having two cooperating stitch forming devices, a" mechanism consisting of a flexible flat reciprocating blade having vits forward end elevated above the body of the blade and provided with a lateral hook to seize the thread at a point between said devices; means for moving said blade rearwardly to form an elondit titi

gated loop in said thread; -a'work support; a

presser foot above said support; two thin plates riveted together and between which said loop is drawn by said blade for temporarily gripping said loop until the next forward movement of said blade; and means for moving said blade forwardly over the top of said plates and releasing the loop from said hook.

13.A In a sewing machinefor stitching together the opposite walls of a pad containing a thick layer of fluiy material and having two cooperating stitch forming devices, a mechanism consisting of a, fiexible flat reciprocating blade having its forward end elevated above the body of the blade and provided with a lateral hook to seize the thread at a point between said devices; means for movinglsaid blade rearwardly to form an elongated loop in said thread; a work support; a. presser foot above said support; independent means comprising plates secured to said presser foot for gripping an intermediate portion of said loop until the next forward movement of said blade, said plates at their forward ends having oppositely disposed inclined faces at a corner thereof forming a mouthto receive the hook in its rearward movement; and` means whereby said blade in its forward movement will pass over the top of said gripping means.

14. In a sewing machine for stitching together the opposite walls of a pad containing a thick layer of uffy material and having two cooperating stitch forming devices, a mechanism consisting of a flat reciprocating blade of spring metal provided at its forward end with a hookY to seize the thread at a point between said devices; an oscillating disk to which the rear end of said blade is secured; means for actuating said disk to move said blade rearwardly to form an elongated loop in said thread; a work support; a presser foot above said support; and independent means secured to said presser foot for gripping intermediate portions of said elongated loop until the next forward movement of said blade, and means whereby in the forward movement of said blade it will pass over the top of said gripping means.

CHARLES T. GOULD. HERBERT M. BONNEY.' 

